Flash Flood Warning 12, NWS Boise, ID

Issued

Aug 26, 2002, 7:00 PM MDT (01:00 UTC)

Expired

Aug 26, 2002, 8:00 PM MDT

In force

60 min

Issued by

NWS Boise, ID

Area

Counties, with a storm outline in the text

Counties Boise County, ID, Elmore County, ID

The Boise radar (KCBX), 67 km from the middle of the area, began a volume at 01:01 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this flash flood warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

000 
WGUS55 KBOI 270100
FFWBOI
IDC015-039-270200-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BOISE ID
659 PM MDT MON AUG 26 2002

THE NATIONAL WEATHER SERVICE IN BOISE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTH CENTRAL ELMORE COUNTY IN SOUTHWEST IDAHO
  SOUTH CENTRAL BOISE COUNTY IN WEST CENTRAL IDAHO

* UNTIL 800 PM MDT

* AT 650 PM MDT...WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY
  RAIN OVER NORTH CENTRAL ELMORE COUNTY...OR ABOUT 25 MILES NORTH OF
  ANDERSON DAM.  THE AREA OF HEAVY RAIN WAS NEARLY STATIONARY.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE. IF YOUR VEHICLE STALLS, ABANDON IT IMMEDIATELY AND SEEK
HIGHER GROUND.

TO REPORT SEVERE WEATHER HAVE THE NEAREST LAW ENFORCEMENT AGENCY
RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN
BOISE.

LAT...LON 4390 11536 4368 11537 4363 11572 4381 11571

NWS Boise, ID wrote its last area forecast discussion before this flash flood warning went out at Aug 26, 3:10 PM MDT, 3 hours 50 minutes earlier.

SOUTHWEST IDAHO/SOUTHEAST OREGON AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE IDAHO
310 PM MDT MON AUG 26 2002

UPPER LEVEL TROUGH OVER THE NORTHERN ROCKIES IN THE PROCESS OF
CLOSING OFF OVER SOUTHERN IDAHO AND ADJACENT AREAS...WHERE ACCORDING
TO MODELS IT WILL REMAIN ISOLATED FROM THE WESTERLIES THROUGH
WEDNESDAY NIGHT BEFORE BEING KICKED OUT THURSDAY BY A DEEPER TROUGH
SETTLING OVER THE PACIFIC NORTHWEST FRIDAY. BY LABOR DAY MRF SHOWS
THIS FILLING AND DRIFTING SOUTH WITH MAIN WESTERLY JET HOLDING JUST
NORTH OF OUR CWFA FOR A DRY AND SOMEWHAT WARMER LAST DAY OF
EXTENDED. CURRENTLY CONVECTION IS SCATTERED OVER CENTRAL IDAHO AND
NORTHEAST OREGON MOUNTAINS AS WELL AS NORTHWARD OVER WESTERN
MONTANA. COOL AIR ALOFT PLUS SURFACE HEATING OF RELATIVELY MOIST
UNSTABLE AIRMASS SEEMS TO BE MAIN SUPPORT RATHER THAN DYNAMICS SO
EXPECT CONVECTION TO FADE OUT BY LATE THIS EVENING WITH ONLY WIDELY
SCATTERED SHOWERS REMAINING BY TUESDAY MORNING. THIS DIURNAL PATTERN
SHOULD REPEAT TUESDAY AND WEDNESDAY WITH CHANCE POPS OVER THE
MOUNTAINS NORTH OF THE SNAKE RIVER VALLEY AND SLIGHT CHANCE
ELSEWHERE. TEMPERATURES WILL STAY A FEW DEGREES BELOW NORMAL FOR
LATE AUGUST THROUGH SUNDAY.   /JT

.BOI...NONE.

Flash Flood Warnings in Idaho, 2002Every flash flood warning in 2002

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.